I used to live in Ontario, Niagara Region, and I have a friend who is interested in leasing my property, which is approximately 3550 sqft commercial space. I agreed to $6000, which includes GST and HST charges. I calculated the value-added tax using a tax calculator that allows me to calculate federal tax and provincial tax by combining them. The Canada tax calculator is completely free and ad-free. The Ontario tax calculator generates insightful data by downloading a PDF file, which can be accessed from anywhere.